Stapler



FIG. 1 is a reduced top front right side perspective view of a stapler showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a left side elevational view, the right side elevational view being the mirror image thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a stapler, as shown and described. 